#define _CRT_SECURE_NO_WARNINGS 1

#include <memory>
class Solution {
public:
    int Sum_Solution(int n) {
        //Sum array[n];
        return ret;
    }

private:
    static int ret;
    static int num;
    class Sum
    {
    public:
        Sum()
        {
            ret += num;
            num++;
        }
    };
};

int Solution::ret = 0;
int Solution::num = 1;